<template>
	<view v-if="goods_info.goods_name" class="goods-detail-container">
		<!-- 轮播图区域 -->
		<swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000" :circular="true">
			<swiper-item v-for="(item,i) in goods_info.pics" :key="i">
				<image :src="item.pics_big" @click="preview(i)"></image>
			</swiper-item>
		</swiper>
		
		<!-- 商品信息区域 -->
		<view class="goods-info-box">
			<!-- 价格 -->
			<view class="goods-price">￥{{goods_info.goods_price}}</view>
			<!-- 商品信息主体区域 -->
			<view class="goods-info-body">
				<view class="goods-name">{{goods_info.goods_name}}</view>
				<!-- 收藏 -->
				<view class="favi">
					<uni-icons type="star" size="18" color="gray"></uni-icons>
					<text>收藏</text>
				</view>
			</view>
			<!-- 运费 -->
			<view class="yf">快递：免费运</view>
		</view>
		
		<rich-text :nodes="goods_info.goods_introduce"></rich-text>
		
		<!-- 商品导航组件区域 -->
		<view class="goods_nav">
			<uni-goods-nav :fill="true"  :options="options" :buttonGroup="buttonGroup"  @click="onClick" @buttonClick="buttonClick" />
		</view>
	</view>
</template>

<script>
	// 按需导入 mapMutations 这个辅助方法
	import { mapMutations , mapGetters} from 'vuex'
	export default {
		computed:{
			...mapGetters('m_cart', ['total'])
		},
		watch:{
			// 定义 total 侦听器，指向一个配置对象
			total:{
				// handler 属性用来定义侦听器的 function 处理函数
				handler(newVal){
					// 2. 通过数组的 find() 方法，找到购物车按钮的配置对象
					const findResult = this.options.find((x)=>x.text === '购物车')
					if(findResult){
						// 3. 动态为购物车按钮的 info 属性赋值
						findResult.info = newVal
					}
				},
				// immediate 属性用来声明此侦听器，是否在页面初次加载完毕后立即调用
				immediate:true
			}
		},
		data() {
			return {
				goods_info:{},
				options: [ {
							icon: 'shop',
							text: '店铺',
							infoBackgroundColor:'#007aff',
							infoColor:"red"
						}, {
							icon: 'cart',
							text: '购物车',
							info: 0
						}],
					    buttonGroup: [{
					      text: '加入购物车',
					      backgroundColor: '#ff0000',
					      color: '#fff'
					    },
					    {
					      text: '立即购买',
					      backgroundColor: '#ffa200',
					      color: '#fff'
					    }
					    ]
			};
		},
		onLoad(options){
			console.log(options)
			const goods_id = options.goods_id
			this.getGoodsDetail(goods_id)
		},
		methods:{
			// 把 m_cart 模块中的 addToCart 方法映射到当前页面使用
			...mapMutations('m_cart', ['addToCart']),
			async getGoodsDetail(goods_id){
				const {data:res} = await uni.$http.get('/api/public/v1/goods/detail',{goods_id})
				if(res.meta.status !==200) return uni.$showMsg()
				//使用字符串的replace()方法，为img标签添加行内的style样式，从而解决图片底部空白间隙的问题
				res.message.goods_introduce = res.message.goods_introduce.replace(/<img /g,'<img style="dispaly:block;"').replace(/webp/g,'jpg')
				this.goods_info = res.message
			},
			//实现轮播图的预览效果
			preview(i){
				//调用uni.previewImage()方法预览图片
				uni.previewImage({
					//预览时，默认显示图片的索引
					current:i,
					//所有图片url地址的数组
					urls:this.goods_info.pics.map(x=>x.pics_big)
				})
			},
			//跳转到购物车页面
			onClick(e){
				if(e.content.text ==='购物车'){
					//切换到购物车页面
					uni.switchTab({
						url:'/pages/cart/cart'
					})
				}
			},
			//加入购物车
			buttonClick(e){
				if(e.content.text==="加入购物车"){
					//组织商品的信息对象
					// { goods_id, goods_name, goods_price, goods_count, goods_small_logo, goods_state}
					const goods = {
						goods_id : this.goods_info.goods_id,
						goods_name : this.goods_info.goods_name,
						goods_price : this.goods_info.goods_price,
						goods_count : 1,
						goods_small_logo : this.goods_info.goods_small_logo,
						goods_state : true
					}
					//调用addToCart方法
					this.addToCart(goods)
				}
			}
		}
	}
</script>

<style lang="scss">
swiper{
	height: 750rpx;
	image{
		width: 100%;
		height: 100%;
	}
}
.goods-info-box{
	padding: 20rpx;
}
.goods-price{
	font-size: 50rpx;
	color: #c00000;
}
.goods-info-body{
	display: flex;
	justify-content: space-between;
	.goods-name{
		font-size: 25rpx;
	}
	.favi{
		font-size: 20rpx;
		width: 100rpx;
		display: flex;
		flex-direction: column;
		align-items: center;
		justify-content: center;
		padding: 0 30rpx;
		border-left: 1rpx solid #efefef;
		color: gray;
	}
}
.yf{
	font-size: 24rpx;
	color: gray;
	margin:  10rpx 0;
}
.goods_nav{
	position: fixed;
	bottom: 0;
	left: 0;
	width: 100%;
}
.goods-detail-container{
	padding-bottom: 100rpx;
}
</style>
